a = 5m
b = 4 m
Area, there is a triangle and a semicircle
1.- Area of the triangle
Area = base x heigth / 2
Area = 4 x 5/ 2
Area = 20/2
Area = 10 m^2
2.- Area of the semicircle
Area = pi *r^2
Area = 3.14 * (2)^2
Area = 12.56
Area of the semicircle = 6.28 m^2
3.- Total area
Total area = area of the triangle + area of the semicircle
Total area = 10 + 6.28
Total area = 16.28 m^2